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Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Parenthetical) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2015
Unconsolidated Real Estate Ventures [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership percentage 0.00% 0.00% 0.00%
Unconsolidated Real Estate Ventures [Member] | Minimum [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership percentage 20.00% 20.00% 20.00%
Unconsolidated Real Estate Ventures [Member] | Maximum [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership percentage 70.00% 70.00% 70.00%
MAP Venture [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership percentage [1],[2]   50.00%  
Acquisition deal costs $ 7.1    
[1] In order to fulfill interest rate protection requirements, a LIBOR interest rate cap of 1.75% was purchased, effective February 3, 2016 and maturing February 9, 2018, for a notional amount of $200.8 million. There are three options to extend the maturity date of the debt for three successive terms, each year representing a separate option.
[2] Ownership percentage represents the Company’s entitlement to residual distributions after payments of priority returns, where applicable.